[PATCH] make the title font bigger in PS output

[Qian Yun]

This patch will make the font of title bigger than the axes label
(X/Y/Z) and units in PS image output.

This will make the default output more suitable for the book.
Unfortunately the font size is not customizable at SPAD level.

BTW, I checked the original book, most images are without title.

- Qian

[Waldek Hebisch]

OK, please commit.

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Waldek Hebisch